Hach ANATEL PAT700 User Manual - page 26
Page 24
Installation
2.5.2 I/O wiring
The analyzer has three 4-20 mA outputs, two discrete inputs, and four discrete outputs.
Connect wiring to the connector blocks located on the I/O circuit board.
•
The connector blocks are a 2-part assembly.
•
The terminal block connector can be unplugged from the analyzer for easier
installation of wiring.
•
Install twisted-pair unshielded wiring, 18 to 14 AWG (1.0 to 2.5 mm
2
).
4-20 mA outputs
The analyzer has three 4-20 mA outputs. Wiring connects to terminals on connector
block J17, as listed in
.
•
Analog output 1 represents TOC (total organic carbon).
•
Analog output 2 represents conductivity or resistivity (user selected).
•
Analog output 3 represents temperature in °F or °C (user selected).
Table 3
J17 connector block
: 4-20 mA output wiring terminal designations
J17 Block
Terminal
Description
Variable
Designation
1
4-20 mA source output for analog output 1 (+)
TOC
AO1+
2
4-20 mA sink output for analog output 1 (–)
TOC
AO1-
3
4-20 mA source output for analog output 2 (+)
Conductivity or resistivity
AO2+
4
4-20 mA sink output for analog output 2 (–)
Conductivity or resistivity
AO2-
5
4-20 mA source output for analog output 3 (+)
Temperature
AO3+
6
4-20 mA sink output for analog output 3 (–)
Temperature
AO3-